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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef GIN_V8_PLATFORM_PAGE_ALLOCATOR_H_
#define GIN_V8_PLATFORM_PAGE_ALLOCATOR_H_
#include "build/build_config.h"
#include "build/buildflag.h"
#include "partition_alloc/buildflags.h"
#if PA_BUILDFLAG(USE_PARTITION_ALLOC)
#include "gin/gin_export.h"
#include "partition_alloc/page_allocator.h"
#include "v8/include/v8-platform.h"
namespace gin {
// A v8::PageAllocator implementation to use with gin.
class GIN_EXPORT PageAllocator final : public v8::PageAllocator {
public:
~PageAllocator() override;
size_t AllocatePageSize() override;
size_t CommitPageSize() override;
void SetRandomMmapSeed(int64_t seed) override;
void* GetRandomMmapAddr() override;
void* AllocatePages(void* address,
size_t length,
size_t alignment,
v8::PageAllocator::Permission permissions) override;
bool FreePages(void* address, size_t length) override;
bool ReleasePages(void* address, size_t length, size_t new_length) override;
bool SetPermissions(void* address,
size_t length,
Permission permissions) override;
bool RecommitPages(void* address,
size_t length,
Permission permissions) override;
bool DiscardSystemPages(void* address, size_t size) override;
bool DecommitPages(void* address, size_t size) override;
bool SealPages(void* address, size_t length) override;
// For testing purposes only: Map the v8 page permissions into a page
// configuration from base.
::partition_alloc::PageAccessibilityConfiguration::Permissions
GetPageConfigPermissionsForTesting(v8::PageAllocator::Permission permission);
};
} // namespace gin
#endif // PA_BUILDFLAG(USE_PARTITION_ALLOC)
#endif // GIN_V8_PLATFORM_PAGE_ALLOCATOR_H_
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